There are posts in this forum that mention Windows 8.1.1. When I examine the new Dell X8700 that I'm setting up for a friend, it says 8.1.
Googling, I've only found mention of Windows 8.1, Update 1 (to get the actual update). Info says that if there is a search icon (magnifying glass) in the upper right corner of the "Metro" screen then Update 1 has been installed by the normal update process.
Should I be seeing version 8.1.1 somewhere in Windows on this PC?